<flash> tag in chat

Does anyone know how to use the <flash> tag? I mean what do the numbers mean? I know the first three somehow correspond to RGB color values, but I’ve seen values greater than 255 being used (in the console) and I still don’t know what the fourth value means. Anyone care to explain?

EDIT: I’ve figured out the fourth value is the speed. But I still don’t understand how you can make multiple colors by using values greater than 255 for the other three.

Does anyone know how to use the <flash> tag? I mean what do the numbers mean? I know the first three somehow correspond to RGB color values, but I’ve seen values greater than 255 being used (in the console) and I still don’t know what the fourth value means. Anyone care to explain?

EDIT: I’ve figured out the fourth value is the speed. But I still don’t understand how you can make multiple colors by using values greater than 255 for the other three.